172070782570721 has 4 divisors (see below), whose sum is σ = 172070877355200. Its totient is φ = 172070687786244.

The previous prime is 172070782570637. The next prime is 172070782570747. The reversal of 172070782570721 is 127075287070271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 172070782570721 - 2³⁸ = 171795904663777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (172070782570121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44614901 + ... + 48318018.

It is an arithmetic number, because the mean of its divisors is an integer number (43017719338800).

Almost surely, 2^{172070782570721} is an apocalyptic number.

It is an amenable number.

172070782570721 is a deficient number, since it is larger than the sum of its proper divisors (94784479).

172070782570721 is an equidigital number, since it uses as much as digits as its factorization.

172070782570721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94784478.

The product of its (nonzero) digits is 5378240, while the sum is 56.

The spelling of 172070782570721 in words is "one hundred seventy-two trillion, seventy billion, seven hundred eighty-two million, five hundred seventy thousand, seven hundred twenty-one".